委托，匿名方法

1、实名委托        
        //定义委托
        private delegate string ChangeEventHandle();
        private delegate int intEventHandle(int ID);


        private void button1_Click(object sender, EventArgs e)
        {
            //new一个委托
            ChangeEventHandle c = new ChangeEventHandle(Function);
            this.Text = c.Invoke();  //委托调用
            this.Text = c();

           
        }
        private void button2_Click(object sender, EventArgs e)
        {
            intEventHandle c1 = new intEventHandle(Function);
            this.Text = c1(5).ToString();
        }
        private string Function()
        {
            return "delegate";
        }


        private int Function(int ID)
        {
            return ID*ID;
        }

 2、匿名委托，不定义名称

List<int> lst = new List<int>(){0,2,3,8,9};

List<int> find = lst.FindAll(delegate(int i) { return i > 5; });

结果8,9

        private void test()
        {
            label1.Invoke(new EventHandler(delegate(object o, EventArgs e)
            {
                label1.Text = "ceshi";
            }));

            this.button1.Invoke(new MethodInvoker(delegate()
            {
                label1.Text = "ceshi";
            })); 

        }

匿名方法

            delegate string MyDelagate(string val);

           //中括号部分定义来了一个方法，没有名称，编译器会定指定一个名称，my为委托的名称
            MyDelagate my = delegate(string param)
            {
                string str2 = " 匿名方法内部 ";
                return param + str1 + str2;
            };

       实名方法
       delegate string MyDelagate(string val);
        private void button2_Click(object sender, EventArgs e)
        {
            MyDelagate my = new MyDelagate(fun);
            my("实名方法");

        }
        static void MyFun(string str)
        {
            Console.Write(str);
        }